Helmet resembling a demon skull



FIG. 1 is a front elevation view of a helmet resembling a demon skull showing my new design;

FIG. 2 is a rear elevation view thereof;

FIG. 3 is a right side elevation view thereof, the left side being a mirror image;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a front left perspective view thereof.

The details shown in broken lines form no part of the claimed design. 

The ornamental design for a helmet resembling a demon skull, as shown and described. 